Sergei Peretiatko

I own board server — the stateful monolith role that holds every open board in memory and serves the collaboration on it. I set the direction for its replacement and build it, Collaboration Runtime. • Collaboration Engine. Defined the requirements and the core runtime: an embeddable Kotlin/Netty library with an application registry, so teams can build stateful collaborative products without the monolith or the legacy framework. Onboarded the first consumer team and worked through their design with them. •

I owned board server: the stateful monolith role serving every open board, built on the framework I had spent the previous eight years on at Alternativa Platform. Storage, transport, and everything that breaks at scale. • Scale, 2020. COVID took traffic up roughly tenfold in five months. I found and removed the bottlenecks in the collaboration path — profiling, load testing, lock contention, allocation — in a programme targeting one million concurrent users. • Storage. Co-authored the in-memory database f

Core team on the component framework for real-time client-server applications — later the backend foundation of Miro, where I went on to own the role built on it for a further seven years. Main product: Tanki Online, a browser-based multiplayer game serving millions of players and over 150,000 concurrent sessions at peak. • Network layer — real-time client-server transport and protocol for a persistent multiplayer workload at six-figure concurrency. • Data storage — persistence for game and player state a